:root {
  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;
  color-scheme: light dark;
  color: #333333;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}

body {
  margin: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: #e4e7ed;
}

#app {
  margin: 0 auto;
  text-align: center;
}

.box{
  width: 100vw;
  height: 100vw;
  display: flex;
  justify-content: space-between;
}
.ul{
  width: 240px;
  text-align: center;
  padding: 20px;
  background: #6595fd;
}
.ul_text{
  height: 50px;
  line-height: 50px;
  border-bottom:1px solid #98c0fd;
  cursor: pointer;
  color: #ffffff;
  position: relative;
}
.ul_text:before{
  content: '';
  width: 100%;
  height: 2px;
  position: absolute;
  bottom: 0;
  left: 0;
  background: #6595fd;
  border-top: 1px solid #98c0fd;
}
.ul_Bg{
  background: #535bf2;
  color: #ffffff;
}
.li{
  width: calc(100vw - 240px);
  height: 100vh;
  background: #e4e7ed;
}
.virtualListWrap{
  position: relative;
  overflow: auto;
  box-shadow: 0 3px 12px rgba(98,107,181,.25);
}
.placeholderDom{
  opacity: 0;
}
.contentList{
  position: absolute;
  width: calc(100% - 2px);
  height: 100%;
  overflow: hidden;
  border: 1px solid rgba(98,107,181,.15)
}

::-webkit-scrollbar {
  width: 4px;
  height: 4px;
}
::-webkit-scrollbar-thumb {
  border-radius: 10px;
  box-shadow: inset 0 0 5px transparent;
  background: transparent;
}
::-webkit-scrollbar-track {
  box-shadow: inset 0 0 5px transparent;
  border-radius: 10px;
  background: transparent;
}

*, *::before, *::after {
  box-sizing: border-box;
}
